Robert F. Kennedy Jr., the health secretary, shared photos of himself and his grandchildren swimming in waters that handle sewer overflow.

Kennedy Jr. grossed out a lot of people on Sunday after he posted a photo of himself swimming with his grandkids in waters known to be teeming with sewage. The secretary of the Department of Health and Human Services wrote that he was on a “Mother’s Day hike in Dumbarton Oaks Park with Amaryllis,